Optical: systems and elements – Glare or unwanted light reduction – With mirror
Patent
1992-04-06
1993-04-20
Ben, Loha
Optical: systems and elements
Glare or unwanted light reduction
With mirror
359601, 250206, 250214B, G02B 508
Patent
active
052047784
ABSTRACT:
An improved electronic control system for controlling the reflective state of automatic rearview mirrors for automative vehicles, the system including an electrochromic variable reflectance mirror element the reflectivity of which varies over a reflectance range as a function of electrical signal levels applied thereto. The system also includes a first sensing means effective to sense the ambient light level and produce a first electrical signal which is at least in part logarithmically related to the sensed ambient light level. A second sensing means is also provided which is effective to sense the glare causing light level and produce a second electrical signal which is at least in part logarithmically related to the sensed glare causing light level. Means is provided in the control system for combining the signals derived from the first and second electrical signals to produce a third electrical signal which is at least in part indicative of the severity of the glare, and the system also includes improved means which in response to the third electrical signal controls the reflective state of the electrochromic mirror element.
REFERENCES:
patent: 4443057 (1984-04-01), Bauer et al.
patent: 4580875 (1986-04-01), Bechtel et al.
patent: 4793690 (1988-12-01), Gahan et al.
patent: 4799768 (1989-01-01), Gahan
patent: 4886960 (1989-12-01), Molyneux et al.
patent: 4896030 (1990-01-01), Miyaji
patent: 4902108 (1990-02-01), Byker
patent: 4917477 (1990-04-01), Bechtel et al.
Ben Loha
Gentex Corporation
McKinnon Malcolm R.
LandOfFree
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